Pantograph engraving-machine.



J. T. RAWSTHORNE & J. PRYKE.

PANTOGRAPH ENGRAVING MACHINE.

APPLICATION FILED OCT. 7,1907.

Patented May 18, 1909.

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APPLICATION FILED OCT. 7,1907.

Patented May 18, 1909.

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JOSEPH TWEEDALE RAWSTHORNE AND JOHN PRYKE, OF DINTING,.ENGLAND.

PANTOGRAI H ENGRAVING-MACHINE.

Specification of Letters Patent.

Patented May 18, 1909.

Application filed October *7, 1907. Serial No. 396,252.

To all whom it may concern:

Be it known that we, Josnrn TWEEDALE Rawsrrronxn and Jenn PRYKE, Britishsubjects, and residents of Dinting, county of Derby, England, haveinvented certain new Y) and useful Improvements in PantographEngraving-niachines, of which the followlng 1s a specification.

This invention relates to certain improve,

ments in pantograph engraving machines employed for indenting a rolleror die with v a desired pattern such as described in the specificationof Barrs patent No. 82%088.

It is designed to enable the pantograph engraving machine to be moresuccessfully employed for engraving rollers, dies or other metalcylinders with varying gradations of light and shade required in thepattern thereon.

It consists essentially in the addition to the machine, or insubstitution for the punch thereon, of a drill by which the indentswhich have been punched in the die or roller by the punch can be clearedof all burs to provide a clean circular indent or, dot.

The invention will be fully described with reference to the accompanyingdrawings forming part of the specification.

Figure 1. side elevation of a pantograph engraving machine with theinvention applied thereto. Fig. 2. side elevation enlarged of thedrilling mechanism removed from the machine. Fig. 3. plan of Fig. 2.

The machine is constructed in the usual way as described in the formerspecification.

A bracket E which may be substituted for the punch bracket with apivoted arm or bar B is socketed in the upright stand or bracket- 6 ofthe machine carried by the movable bed. At the outer end of the pivotedbar or arm B a rotary drill A is mounted in suitable bearings. Thevertical drill spindle a is fitted at its upper end with a driving wheela which is driven by a horizontal shaft a and wheel a and thisin turn isoperated by a vertical spindle M with gearing m. The vertical spindle Mis driven in one direction by a horizontally sliding rack N which gearswith a pinion n on the spindle and in the reverse direction by a helicalspring P. The rack N is moved inward by a bell crank lever P the upperend of which is moved forward each time the drill A is lowered into oneof the dots or indents in the die or roller R.

The transverse bar B on which the drill arm 13 rests and by which it islowered when the treadle B is depressed extends across the machine andthe lower member 9 of the bell crank lerer P rests against it so thateach downward movement of the transverse bar 1.) to lower the drill alsorocks the bell crank lever P and rotates the drill A.

The horizontal shaft 05 is preferably arranged as shown with twouniversal joints though the bar 13 may be so shaped and the drill soarranged that a straight shaft may be employed but in the drawing it isshown as an example applied to the existing punch arm B withoutalteration. The drill may be applied to the same machine as that towhich the punch is applied, the punch being removed and the drillsubstituted therefor either on the punch bracket or on a substituteddrill bracket. Or in other instances the punch may be used on onemachine and the drill be used on another machine, the work beingtransferred from the one machine to the other.

The drill is weighted in the usual way by a sliding weight C. To thesliding weight C an adjusting rod D is connected by which the positionof the weight C upon the bar B can be altered to give the desired weightto the drill. The adjusting rod D extends out to the front of themachine to within reach of the hand of the operator so that by moving ithe can without rising from his seat and leaving the pattern table of themachine thereby move the weight and adjust itsposition relatively to thedrill. The adjusting rod D is connected to the weight G by a doublejointed link (Z and a radius rod d on a pivot (P. The radius rod (Z isfitted at the joint end with a cross bar (Z extending above and belowthe joint. Springs g" are attached to the top and bottom ends of thecross bars and to a collar or bar (Z 011 the adjusting rod D at theother side of the joint to give the desired rigidity to the joint andprevent the link (Z falling or sagging.

A screw F is fitted to the rod D passing through a sliding nut H towhich the rod is attached preferably near the front end with a handwheel or knob G to rotate the screw whereby the rod may be drawnbackwards or forward to adjust and regulate the weight C.

The engraver without moving from his place at the pattern plate-byturning the screw and moving the rod D can adjust the position of theweight C and force of the blow and thereby graduate the shade of thepattern on the die either lighter or darker as required by the pattern.

What we claim as our invention and desire to protect by Letters Patentis 1. In a pantograph engraving machine of the type referred to thecombination with the pivoted arm B and means for operating the said arm,of a drill mounted thereon, a rotary shaft and gearing connected withthe drill and means for rotating the shaft by which the drill isoperated on the falling of the arm B substantially as described.

2. In a pantograph engraving machine of the type referred to thecombination with the pivoted arm B and means for operating the said armof a drill mounted in the said arm, shafts and gearing by which thefalling of the arm rotates the drill, a sliding rack to operate theshafts and a pivoted cranked lever engaging the sliding rack by whichthe drill is operated when the arm B is lowered substantially asdescribed.

3. In a pantograph engraving machine of the type referred to thecombination with the pivoted arm B and means for operating the said armof a drill mounted in the said arm means by which the falling of the armB rotates the drill, and adjustable sliding weight C on the said arm, arod D pivotally connected with the said Weight extending toward thefront of the machine within reach of the operator, and a bracketsupporting the said rod aflixed to the machine substantially asdescribed.

4:. In a pantograph engraving machine of the type referred to thecombination with the pivoted arm B and means for operating the said armof a drill mounted in the said arm means by which the falling of thearmB rotates the drill, an adjustable sliding weight C on the said arm,a rod D pivotally connected with the said weight extend ing toward thefront of the machine Within reach of the operator, a radius rod cZinterposed between the rod D and the weight, a double jointed link (Zconnecting the radius rod d with the adjusting rod D, a cross bar (Z onthe end of the radius rod, a collar cl on the adjusting rod, and springsg attached to the said cross bar and collar to give the desired amountof rigidity to the flexible joint substantially as described.

In a pantograph engraving machine of he type referred to the combinationwith the pivoted arm B and means for operating the said arm of a drillmounted in the said arm means by which the falling of the armB rotatesthe drill, an adjustable sliding weight C on the said arm, a rod Dpivotally connected with the said weight extending toward the front ofthe machine within reach of the operator, the connecting link cl theradius rod (Z interposed between the rod D and the weight and springs gforming a flexible joint, the bracket E to support the adjusting rod D,a movable nut H on the end of the adjusting rod, a screw F engagingtherewith by which to operate the rod and a hand wheel G to rotate thescrew substantially as described.

In witness whereof, we have hereunto signed our names in the presence oftwo subscribing witnesses.

JOSllPH TWEEDALE RAWSTHORNE. JOHN PRYKE. Witnesses:

J. OWDEN OBRIEN, B. TATHAM TVVOODHEAD.

